rnk added a comment. @vsapsai @bruno The use case is distributed compilation. I am unfamiliar with the changes in question, but essentially, if every input to clang is rooted in /Users/foo and the build works there, we should be able to move it all to /Users/bar, change directories, and the build should still work. It seems that this doesn't work for header maps, but I haven't reviewed the code change or test and know nothing else about this feature.
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